1
JEE Main 2017 (Offline)
+4
-1
The following observations were taken for determining surface tension T of water by capillary method:
diameter of capillary, D = 1.25 $$\times$$ 10-2 m
rise of water, h = 1.45 $$\times$$ 10-2m
Using g = 9.80 m/s2 and the simplified relation T = $${{rhg} \over 2} \times {10^3}N/m$$, the possible error in surface tension is closest to :
A
10 %
B
0.15 %
C
1.5 %
D
2.4 %
2
JEE Main 2016 (Online) 9th April Morning Slot
+4
-1
In the following ‘I’ refers to current and other symbols have their usual meaning. Choose the option that corresponds to the dimensions of electrical conductivity :
A
ML$$-$$3 T$$-$$3 I2
B
M$$-$$1 L3 T3 I
C
M$$-$$1 L$$-$$3 T3 I2
D
M$$-$$1 L$$-$$3 T3 I
3
JEE Main 2016 (Offline)
+4
-1
A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be :
A
92 $$\pm$$ 1.8 s
B
92 $$\pm$$ 3 s
C
92 $$\pm$$ 2 s
D
92 $$\pm$$ 5.0 s
4
JEE Main 2016 (Offline)
+4
-1
A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminium. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is 0.5 mm and the 25th division coincides with the main scale line?
A
0.70 mm
B
0.50 mm
C
0.75 mm
D
0.80 mm
EXAM MAP
Medical
NEET